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48 lines
1.1 KiB
48 lines
1.1 KiB
/*
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* If a mark-and-sweep finalizer creates a new reachable object, the object
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* must not be collected even though it has not been marked reachable.
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* This is handled correctly by the implementation: finalizers run after
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* the sweep pass has been completed and new elements and references created
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* by the finalizer are considered in the next pass.
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*/
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/*===
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removing references
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obj1 and obj2 unreachable now
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forced gc
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finalizer obj1
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bar
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forced gc
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bar
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forced gc
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bar
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===*/
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var newobj = null;
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var obj1 = { name: 'obj1' };
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Duktape.fin(obj1, function (o) {
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print('finalizer', o.name);
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newobj = { foo: 'bar' };
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});
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var obj2 = { name: 'obj2' };
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obj1.ref = obj2; // use circular reference to avoid refcount
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obj2.ref = obj1; // based collection
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print('removing references');
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obj1 = null;
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obj2 = null;
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print('obj1 and obj2 unreachable now');
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print('forced gc');
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Duktape.gc(); // finalizer executes and creates 'newobj'
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print(newobj.foo);
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print('forced gc');
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Duktape.gc(); // 'newobj' survives collection
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print(newobj.foo);
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print('forced gc');
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Duktape.gc();
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print(newobj.foo);
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